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Finding the Fourth Proportional to 47.28, 70.32 and 45.77

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Solution

The fourth proportional to 47.28, 70.32 and 45.77 is: 68.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.28 : 70.32 = 45.77 : x
  2. Step 2: Convert to fraction form
    47.28/70.32 = 45.77/x
  3. Step 3: Cross multiply
    47.28x = 70.32 × 45.77
  4. Step 4: Simplify right side
    47.28x = 3,218.11
  5. Step 5: Solve for x
    x = 3,218.11/47.28
  6. Step 6: Final answer
    x = 68.06

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.